You don't have a virus. Your numlock key is turned on. Notice how those same keys are actually labelled with numbers on them, in a different color?
Usually, there's a key to toggle that behaviour. Like, find the key labelled "NUMLOCK" in a different color. Then, hit your Fn key and the NUMLOCK key at the same time. Things should be back to normal for you.
Keep in mind, there's absolutely no virus, to my knowledge, that remaps your keyboard like this.